Despite the variability of the symptoms on leaves, something's niggling me; perhaps its partly the fact that I can see no sign of it on the (few) fruits I can see. There's a chance it could be something else.

...But, having thought and researched a bit (rusts, leaf spots, ertc.), I can't find anyhting closer. So apple scab is the best I can come up with.

Now I've given you that pointer, perhaps you can compare photos with more leaves (and fruit) on your tree. You might be able to decide it is or isn't.

If you are near an RHS garden, you can probably take a sample there for an opinion.

Mike

PS. wind can cause somewhat similar damage to leaves, especially if they flap about against other twigs